That field controls the order that the roles are displayed on the settings page and the registration page. The lower the number, the earlier it will appear in the list.
We will be changing that in the next update. We're considering simply removing that field and always displaying the roles alphabetically. If we don't do that, we'll hide that "sort order" field and allow you to drag and drop the roles into the order you choose. We're trying to find the right balance between simplicity and flexibility. If you have an opinion about whether or not it is useful to be able to manually control the order these fields appear, let us know.
Thank you! I vote for the "drag and drop" method! :-)
We would benefit from the ability to manually manipulate the order the roles are displayed
Customer support service by UserEcho